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Title: Seniority, collectivity, and B(E2) enhancement in {sup 72}Ni

Abstract

Gamma rays assigned to {sub 28}{sup 72}Ni{sub 44} have been identified with Gammasphere in deep-inelastic reactions involving a 450-MeV {sup 76}Ge beam and a {sup 198}Pt target. Using a combination of spectra produced by double gates on the known 454-, 843-, and 1095-keV members of the ground-state cascade, a coincident line at 199 keV has been identified and is tentatively assigned as the 8{sup +}{yields}6{sup +} transition. These {gamma}-ray coincidences have been observed only in prompt events, indicating an 8{sup +} half-life below 20 ns and requiring a large B(E2) enhancement compared to that expected from a seniority scheme. This value is consistent with models showing decay to a seniority {nu}=4, 6{sup +} level that is depressed by the same two-body interaction responsible for the rather low 1095-keV 2{sub 1}{sup +} energy, as compared to the valence-symmetry counterpart {sub 44}{sup 94}Ru{sub 50}.

Authors:
;  [1];  [2]; ;  [1]; ; ; ; ; ; ; ; ; ; ;  [3]; ; ;  [4]; more »;  [5] « less
  1. Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742 (United States)
  2. (United States)
  3. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  4. Niewodniczanski Institute of Nuclear Physics PAN, Radzikowskiego 152, PL-31-342 Krakow (Poland)
  5. Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
21596801
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.84.037304; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BEAMS; DECAY; DEEP INELASTIC SCATTERING; GAMMA RADIATION; GERMANIUM 76; GROUND STATES; HALF-LIFE; KEV RANGE 100-1000; MEV RANGE 100-1000; NICKEL 72; PLATINUM 198; SPECTRA; SYMMETRY; TWO-BODY PROBLEM; VALENCE; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; ELECTROMAGNETIC RADIATION; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; GERMANIUM ISOTOPES; HEAVY NUCLEI; INELASTIC SCATTERING; INTERACTIONS; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOTOPES; KEV RANGE; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; MANY-BODY PROBLEM; MEV RANGE; NICKEL ISOTOPES; NUCLEI; PARTICLE INTERACTIONS; PLATINUM ISOTOPES; RADIATIONS; RADIOISOTOPES; SCATTERING; SECONDS LIVING RADIOISOTOPES; STABLE ISOTOPES

Citation Formats

Chiara, C. J., Stefanescu, I., Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Walters, W. B., Sharp, N., Alcorta, M., Carpenter, M. P., Hoffman, C. R., Janssens, R. V. F., Kay, B. P., Lauritsen, T., Lister, C. J., McCutchan, E. A., Rogers, A. M., Seweryniak, D., Zhu, S., Fornal, B., Pawlat, T., Wrzesinski, J., Guerdal, G., and Kondev, F. G. Seniority, collectivity, and B(E2) enhancement in {sup 72}Ni. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.037304.
Chiara, C. J., Stefanescu, I., Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Walters, W. B., Sharp, N., Alcorta, M., Carpenter, M. P., Hoffman, C. R., Janssens, R. V. F., Kay, B. P., Lauritsen, T., Lister, C. J., McCutchan, E. A., Rogers, A. M., Seweryniak, D., Zhu, S., Fornal, B., Pawlat, T., Wrzesinski, J., Guerdal, G., & Kondev, F. G. Seniority, collectivity, and B(E2) enhancement in {sup 72}Ni. United States. doi:10.1103/PHYSREVC.84.037304.
Chiara, C. J., Stefanescu, I., Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Walters, W. B., Sharp, N., Alcorta, M., Carpenter, M. P., Hoffman, C. R., Janssens, R. V. F., Kay, B. P., Lauritsen, T., Lister, C. J., McCutchan, E. A., Rogers, A. M., Seweryniak, D., Zhu, S., Fornal, B., Pawlat, T., Wrzesinski, J., Guerdal, G., and Kondev, F. G. Thu . "Seniority, collectivity, and B(E2) enhancement in {sup 72}Ni". United States. doi:10.1103/PHYSREVC.84.037304.
@article{osti_21596801,
title = {Seniority, collectivity, and B(E2) enhancement in {sup 72}Ni},
author = {Chiara, C. J. and Stefanescu, I. and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 and Walters, W. B. and Sharp, N. and Alcorta, M. and Carpenter, M. P. and Hoffman, C. R. and Janssens, R. V. F. and Kay, B. P. and Lauritsen, T. and Lister, C. J. and McCutchan, E. A. and Rogers, A. M. and Seweryniak, D. and Zhu, S. and Fornal, B. and Pawlat, T. and Wrzesinski, J. and Guerdal, G. and Kondev, F. G.},
abstractNote = {Gamma rays assigned to {sub 28}{sup 72}Ni{sub 44} have been identified with Gammasphere in deep-inelastic reactions involving a 450-MeV {sup 76}Ge beam and a {sup 198}Pt target. Using a combination of spectra produced by double gates on the known 454-, 843-, and 1095-keV members of the ground-state cascade, a coincident line at 199 keV has been identified and is tentatively assigned as the 8{sup +}{yields}6{sup +} transition. These {gamma}-ray coincidences have been observed only in prompt events, indicating an 8{sup +} half-life below 20 ns and requiring a large B(E2) enhancement compared to that expected from a seniority scheme. This value is consistent with models showing decay to a seniority {nu}=4, 6{sup +} level that is depressed by the same two-body interaction responsible for the rather low 1095-keV 2{sub 1}{sup +} energy, as compared to the valence-symmetry counterpart {sub 44}{sup 94}Ru{sub 50}.},
doi = {10.1103/PHYSREVC.84.037304},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}